Treatment of acetate silk



Patented up. 14, 193% is'iasea 'rnnarn'r or answers in George Heberlein,

.ln, Wattwil, Switzerland,

and Albert er. assignors to HQEBQBHE Patent (Corporation, New York, N. K, a ear-=- poration of New York No Drawing. Application September 2%,

rear.

1fiegial No. 5541.478. in Germany deptem 2%.,

a his.

covers only some portions of the fabric there.

result very pleasing pattern eifects by virtue of the contrast thus obtained between the bright and the matte surfaces. It is also known that solvents or swelling agents are capable of acting on acetate cellulose to accelerate or to slow up the matting action of moist steam or hot water. On the basis of these procedures two different processes for the production of the desired effects have been worked out. In one of these processes the delustring promoting agent was applied to the fabric together with a thickener or paste and dried and finally the matting efiect was produced by steaming for a prolonged period of time. With the second procedure the acetate silk received an imprint with a resist stable to hot water, there being added to the resist an agent to decelerate the delustring effect, whereupon the unprotected portions were delustered by dipping into boiling water.

The delustring process even with an accelerator was carried out at or very near the boiling temperature of water and the action of the accelerator had to be carried out at that temperature. If no accelerator was used the proper delustring of the silk required considerable time.

The principal object of the present invention accordingly is to provide an efiicient process of the kind mentioned for producing an improved print matte-effect on artificial silk in an improved way. I

The invention comprises the novel products as well as the novel processes and steps of processes according to which such products are manufactured, the specific embodiments of which are described hereinafter by way of example and in accordance with which we now prefer to practice the invention.

Applicants have found that delustring is accomplished easily and simply by printing a thickened accelerator upon the'acetate silk and thereupon passing the printed material through a water bath containing a. neutral or feebly alkaline salt in solution. The solution employed should preferably be dilute. After such treatment the printing substance is subsequently warm water.

face.

fabrics comprising other fibers (oi. l

removed by washing with cold or moderately The temperature of the bath and other reaction conditions are such that the-orig.- inal luster. of the acetate silk in, the unprinted portions remains substantially unchanged. By

this process which preferably operates below the I boiling point for a short time, the luster of the acetate silk which has not been printed upon, is preserved while the luster of the printed portion is changed into a matte or delustered sur- In other words we have found that the bath temperature and time which we employ for carrying out the process are insuficient for de-= lustring the acetate silk, but nevertheless are able to cause delustring through the action of the accelerator. The result is the production of a new product, namely full-lustered acetate silk with a delustered pattern which so far as we know is new in this art. I

For this purpose viz. ma the protective bath the most varied salts are usable, asgfor example ordinary cooking salt, sodium sulphate, potassium nitrate, sodium acetate or the like. Apparently these salt solutions produce the efiect that the salts exercise a decelerating action on the uncovered parts of the fabric while the pertions covered with paste are not readily penetrated by the salts so that the portions covered with'the resist or paste come in contact with the pure hot water, immediate action resulting from. such contact, such action being further promoted by the accelerators used.

The new process offers the merit of greater dependability as to outcome and production of a sharp contrast effect in that the unprinted surface portions provide a perfect luster, whereas the printed parts assume a complete or delustered or matte surface.

As dulling-accelerators may be used the swelling and solving agents of an aliphatic nature as known in the art, such as chlorinated hydrocarbons, alcohols, esters, ketones, etc., or of arcmatic nature, such as amins, aldehydes, phenols,

naphthols, etc., or heterocyclic bodies such as 100 pyridine, quinoline, etc. It is feasible to secure ornamental dulling effects by the aid of the, present process upon all structures containing acetate silk, such as yarns, textures, braidings or other surface-like structures. Also mixed with acetate silk are susceptible to such fining effect.

The following are embodiments of the invention, such examples being given simply as illustrations, and it is to be understood that the invention is not restricted to these specific embodimentszv I. An all acetate silk fabric is printed with the following paste:

. Parts Gum arabic, solution 1:1 850 Phenol 15 Parts Tragacanth 1:10 800 Glycol chlorhydrin 200 After printing and drying pass the fabric into a 1% sodium acetate solution for 20 seconds at a temperature of about 90 degrees C. After this treatment the fabric is further processedas indicated under Example I.

III. Knitted material from acetate silk is printed in the followingway:

Parts Gum arabic, solution 1:1 Z00 Pyridine 300 After printing developing is efiected in a 1% aqueous solution of potassium nitrate at 90 degrees C., and a developing time of 30 seconds. The material is thereupon washed and finished in the customary way.

The materials produced in accordance with the above examples have a substantially unchanged lustrous appearance in the unprinted portions with sharply contrasting delustered or matte-efiects in portions where the delustring accelerators have been printed thereon.

We claim:

1. A process for producing printed matteeflfects on acetate silk which comprises printing a paste thereon containing a swelling agent as a delustring accelerator, passing the printed silk through a hot inorganic salt solution capable of preserving substantially unchanged the lustre of the unprinted silk and changing the lustre of the printed portion of said silk by said salt solution. p

2. A process for making printed matte-effects on acetate silk which comprises printing a paste thereon containing gum tragacanth 1:10 800 parts, glycol chlorhydrin 200 parts and passing the fabric through sodium acetate solution for 20 seconds at a temperature of about C.

3. A process for making printed matte-efiects on acetate silk which comprises printing a paste thereon containing gum arabic solution 1:1 700 parts. pyridine 300 parts, and passing the silk (for thirty seconds) through a 1% aqueous solution of potassium nitrate at about 90 C.

4. A process for producing printed matte-effects on acetate silk which comprises printing a paste thereon containing a swelling agent as a delustring accelerator and passing the printed silk through a neutral or feebly alkaline salt solution for a short time at a temperature a little below the boiling point of water, so that the unprinted portion of the silk is substantially unchanged while the printed portion is changed into a sharply contrasting delustring surface. GEORGE HEBERLEIN, JR. ALBERT BODMER. 

